William duchemin



(No Model.)

W. DUGHEMIN.

V BASTINGMAGHINE. No. 339,536. PatentedApr. 6, 1886.

N, PETERS, Phololithcgraphnr, \k'ishington. 0.1:.

Unitas dramas ATENT Quince.

ADDAX BASTING MACHINE COMPANY, OF SAME PLACE.

BASTlNG-MACHINE.

SPECIFICATION forming part of Letters Patent No. 339,536, dated April 6,1886. Application filed January 13, 1885. Serial K0. 152,737. (No model.)

To all whom it may concern.-

Be it known that 1, WILLIAM DUOHEMIN, a subject of Her Britannia Majesty, and a resident of Boston, in the county of Suffolk and State of Massachusetts, haveinvented a new and useful Improvementin Easting-Machines, of which the following is a specification.

The object of my invent-ion is to provide a sewing-machine which is capable, by reason of the great length of its stitches, of doing all classes and forms of that kind of sewing known as basting as readily as ordinary sewingmachines may produce with short stitches. The means by which I accomplish this result are shown in the accompanying drawings, in which I have not thought it necessary to show the goose-neck and head and other parts common to all sewing-machines, especially those known as \Villcox 8t Gibbs, whichIhave found the most easily adapted to my invention.

Figure l is an inverted plan of the body of a lHOOX & Gibbs sewing-machine with myimproved mechanism substituted for the devices therein ordinarily employed. Fig. 2 is an upright vertical section on line a: a: of Fig. 1. Fig. 3 is an upright vertical section on line y y of Fig. l.

The same letters indicate similar parts in the different drawings.

A is the feed-driving cam on the main shaft a of the machine. This cam drives back and forth the pitman B, the outer end of which is attached by a pivot-joint to the slotted lever G by the screw 2). This lever C has an adjustable fulcrum, D, and its free end is connected by a pivot-joint to the sliding feedcarriage E. The feed F is secured to the outer end 01' this carriage E, which moves back and forth between the parallel bearings G G, riveted to the bed-plate of the machine. The fulcrum D is made adjustable in the slot 0 of a slotted plate, H, riveted to the bed-plate of the machine. This cam A is so constructed that when the feed-carriage E is drawn out it will, by the action of the cam, make a short stop, and remain in that position until the feed-dog F falls, when it will be sent in and again stop, and be held stationary until the feed-dog F is raised by the action of cam Z, as will be explained, and grips the material, and so on. This is accomplished by a suitablyshaped groove made in the feed-cam, as all skilled workmen will readily understand.

The adjustable fulcrum D (shown in the drawings, Fig. 3) consists of a set-screw, d, a washer, e, to bear against the lever O, a slide, f, which slips back and forth in the slot of lever G, a fiat piece, g, between the lever 0 and plate H, and a sliding threaded nut, h, which slips back and forth in a slot, '5, in the upper surface of the bed-plate of the machine, and serves to hold together the various pieces of D, and is constructed and operates as follows: The setscrew d is provided at its outer end with a shoulder of such proportion that when the washer e, slide f, and lever G are placed thereon and the plate 9 put in positionnamely, on the small or threaded end of said set-screw, resting against theshoulder named-there will be just room enough for the lever G to play back and forth freely. The sliding piece f has a hole drilled in its center the proper size to fit smoothly .over the shoulder, and is of such width as will permit it to play freely in the slot in the lever 0. Thus the lever has free play back, forth, and around the set-screw d, the threaded end of which is passed through the slotted plate H and screwed home,the slotted plate H being nipped between the plate 9 and the nut h. The setscrew (1, being thus secured,forms a stationary and adjustable fulcrum for the purpose described.

The feed F, Fig. 1, is of peculiar construction. The feed is so constructed that when the slotted lever G is parallel with the working-shaft of the machine the feed-carriage E rests in position to commence the feedthat is, at the extreme limit of its forward reachand the cam-roll on the inner end of the pitman B in that part of the cam-groove farthest from the center of the feed-cam A. The slot in the plate H being directly over and in line with the horizontal slot in the lever 0, it will be seen that the adjustable fulcrum D may pass from one end of said slots to the other without changing the position of the feed-carriage E,

, two inches.

on which is secured the dog F, and that, whatever change may be made in the length of the stiteh,by securing the fulcrum D nearer to or farther from the pitman B, the feed will always commence at the same point, the difference being at the end of the outreach. The lever O in its outward throw would ordinarily describe an arc of a circle which would render it practically useless to draw out the carriage E, which works at right angles therewith in the parallel bearingsc c. This is remedied by the back-and-forth motion already described,

the pitman 13 having lateral play sufficient to cover withoutresistancethe difference of length from start to finish of the longest reach required. The pivot-joint connecting thel ver 0 to the carriage E is so made that it will permit said carriage to drop sufficiently to lower the teeth of the dog F from contact with the material. It is made as follows: A circular stud firmly placed in the free end of the lever 0 passes into and fits smoothly a hole drilled in the outer end of the carriage E. Said stud being a little conical allows for said drop. To lengthen the stitch, the fulcrum D must be moved toward the pitman, and. to shorten it away from the pitman.

At the inner end of the shaft a is the looper I, of the construction ordinarily employed in the XVillcox 82; Gibbs machine, slightly changed in proportions to suit the unusual change in the length of the stitch. On its inner end the shaft a carries a surface or open cam, l, which at a given time raises the lever J, and through it the feed F, and holds it up till the material has been fed through the full length of throw of the lever O. The lever J is hung on the frame-work of the machine by the pivot m, and carries a roller, 11., projecting from its side, and upon this roller rests the feed-carriage E, enabling it to be raised by cam l, as just explained.

The cam Z is rigidly secured in position, and has a large and small circular working-surface, the extremes of the larger terminating in inclined planes, for lifting and releasing the carriage E by the means explained, and is proportioned so that the lift and drop will take place during the stops of said carriage, as already described.

In practice the feed is sent and returned in horizontal parallels, and rises and falls in perpendicular parallels, its lines of action forming a parallelogram, which, the parts being adapted and. proportionate, may be increased to any required length, from one-thirtieth to In practice this feed has a positive and distinct three-way motion-up, in,

and outthe fourth being dependent on and insured by the action of the presser-foot. Thus when the carriage E remains stationary at the extreme limit of its outward reach and released from the action of the cam Z, it drops of its own weight, the first impetus being given by the presser-foot, until the free end of the leverJ rests on the small working plane of said cam, the friction -springj being simply to insure smooth action during the lift of the carriage.

In operation, the needle being at its highest point, the feed commences at the same time the needle begins its downward thrust, and finishes when the point of said needle is halfway down to the cloth, this room being needed to permit the basting of extra thick or wadded material. \Vhen the needle has gone through the material and starts on its return, the carriage E drops, and issent in for the next stitch, being in position therefor when the needle is half-way from the surface of the cloth to its extreme upward reach. At this point the cam l commences to lift the carriage, which it does just before the needle commences its next downward thrust, and so on.

The feed mechanism herein described is entirely difierent in principle and action from that of eccentric motive action, which is continuous and operates equally to or from the center, the length of stitch being governed by the teeth of the dog (said dog being brought back by a spring) in this wise: If the rise of the teeth is proportioned to grip the cloth oneeighth before the highest radius of the eccentric reaches its highest point,the permanent length of the stitch will be one-quarter, and will be less or more as the rise may be made sooner or later, to reduce which any required length it is necessary to use an adjustable stop in front of the needle, as in Villcox & Gibbs machine, whose device has been somewhat modified by other inventors, some of whom still depend on the rise and fall of the teeth of the dog to lengthen or shorten the stitch and retain the spring to bring back the dog, while others do away with the stop. The motion in the latter case, however, is continuous, and the length of the teeth reduced equally in front and rear of the needle, which would of necessity limit the stitch within the range of fine sewing. My invention, differing from all these, is not dependent on or limited by any of the principles recited, and is intended for and efiective in producing a much greater length of stitch.

It will be" understood that I do not claim the cams A and Z as exclusive in a sewingmachine, but simply as timed and arranged for the purposes herein described.

I clain1-- 1. The above described basting-machine, which consists of a needle and needle-bar, with their operating mechanism, in combination with thefeed-cani A and its operating mechanism, the pitman B, slotted lever G, with adjustable fulcrum D, consisting of set-screw d, slide f, piece 9, plate H, and threaded nut operating mechanism, said devices being d, Washer e, slide f, piece g, plate H, and adapted and arranged, as herein described, to threaded nut h,as herein described,'and for the produce stitches of a length and character purposes specified.

known as basting-stitches, as and for the \VILLM. DUUHEMIN. 5 purposes specified. Witnesses:

2. In abasting-maehine,the above-described WALDRON BATES,

adjustable fulcrum 1), consisting of set-screw W. P. PREBLE, J r. 

